aelgen
do you have 4x1gb or 2x2gb? if you have 4x1gb you may try to up a little notch your ram. 2.1v are suggested for 2 banks of ram, if you've got 4 banks installed you may require a little more voltages on ram or on even on nb.
i've experienced it on the dfi 680lt with 4 sticks of ocz flex wich required me to add voltages both on ram and on nb.
or you may try lower a little bit the ram clock if you don't want to add voltages.